[net-next-2.6.git] / fs / affs / affs.h

#include <linux/types.h>
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/amigaffs.h>
#include <linux/mutex.h>

/* AmigaOS allows file names with up to 30 characters length.
 * Names longer than that will be silently truncated. If you
 * want to disallow this, comment out the following #define.
 * Creating filesystem objects with longer names will then
 * result in an error (ENAMETOOLONG).
 */
/*#define AFFS_NO_TRUNCATE */

/* Ugly macros make the code more pretty. */

#define GET_END_PTR(st,p,sz)		 ((st *)((char *)(p)+((sz)-sizeof(st))))
#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
#define AFFS_BLOCK(sb, bh, blk)		(AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])

#ifdef __LITTLE_ENDIAN
#define BO_EXBITS	0x18UL
#elif defined(__BIG_ENDIAN)
#define BO_EXBITS	0x00UL
#else
#error Endianness must be known for affs to work.
#endif

#define AFFS_HEAD(bh)		((struct affs_head *)(bh)->b_data)
#define AFFS_TAIL(sb, bh)	((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
#define AFFS_ROOT_HEAD(bh)	((struct affs_root_head *)(bh)->b_data)
#define AFFS_ROOT_TAIL(sb, bh)	((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
#define AFFS_DATA_HEAD(bh)	((struct affs_data_head *)(bh)->b_data)
#define AFFS_DATA(bh)		(((struct affs_data_head *)(bh)->b_data)->data)

#define AFFS_CACHE_SIZE		PAGE_SIZE

#define AFFS_MAX_PREALLOC	32
#define AFFS_LC_SIZE		(AFFS_CACHE_SIZE/sizeof(u32)/2)
#define AFFS_AC_SIZE		(AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
#define AFFS_AC_MASK		(AFFS_AC_SIZE-1)

struct affs_ext_key {
	u32	ext;				/* idx of the extended block */
	u32	key;				/* block number */
};

/*
 * affs fs inode data in memory
 */
struct affs_inode_info {
	atomic_t i_opencnt;
	struct semaphore i_link_lock;		/* Protects internal inode access. */
	struct semaphore i_ext_lock;		/* Protects internal inode access. */
#define i_hash_lock i_ext_lock
	u32	 i_blkcnt;			/* block count */
	u32	 i_extcnt;			/* extended block count */
	u32	*i_lc;				/* linear cache of extended blocks */
	u32	 i_lc_size;
	u32	 i_lc_shift;
	u32	 i_lc_mask;
	struct affs_ext_key *i_ac;		/* associative cache of extended blocks */
	u32	 i_ext_last;			/* last accessed extended block */
	struct buffer_head *i_ext_bh;		/* bh of last extended block */
	loff_t	 mmu_private;
	u32	 i_protect;			/* unused attribute bits */
	u32	 i_lastalloc;			/* last allocated block */
	int	 i_pa_cnt;			/* number of preallocated blocks */
	struct inode vfs_inode;
};

/* short cut to get to the affs specific inode data */
static inline struct affs_inode_info *AFFS_I(struct inode *inode)
{
	return list_entry(inode, struct affs_inode_info, vfs_inode);
}

/*
 * super-block data in memory
 *
 * Block numbers are adjusted for their actual size
 *
 */

struct affs_bm_info {
	u32 bm_key;			/* Disk block number */
	u32 bm_free;			/* Free blocks in here */
};

struct affs_sb_info {
	int s_partition_size;		/* Partition size in blocks. */
	int s_reserved;			/* Number of reserved blocks. */
	//u32 s_blksize;			/* Initial device blksize */
	u32 s_data_blksize;		/* size of the data block w/o header */
	u32 s_root_block;		/* FFS root block number. */
	int s_hashsize;			/* Size of hash table. */
	unsigned long s_flags;		/* See below. */
	uid_t s_uid;			/* uid to override */
	gid_t s_gid;			/* gid to override */
	umode_t s_mode;			/* mode to override */
	struct buffer_head *s_root_bh;	/* Cached root block. */
	struct mutex s_bmlock;		/* Protects bitmap access. */
	struct affs_bm_info *s_bitmap;	/* Bitmap infos. */
	u32 s_bmap_count;		/* # of bitmap blocks. */
	u32 s_bmap_bits;		/* # of bits in one bitmap blocks */
	u32 s_last_bmap;
	struct buffer_head *s_bmap_bh;
	char *s_prefix;			/* Prefix for volumes and assigns. */
	char s_volume[32];		/* Volume prefix for absolute symlinks. */
	spinlock_t symlink_lock;	/* protects the previous two */
};

#define SF_INTL		0x0001		/* International filesystem. */
#define SF_BM_VALID	0x0002		/* Bitmap is valid. */
#define SF_IMMUTABLE	0x0004		/* Protection bits cannot be changed */
#define SF_QUIET	0x0008		/* chmod errors will be not reported */
#define SF_SETUID	0x0010		/* Ignore Amiga uid */
#define SF_SETGID	0x0020		/* Ignore Amiga gid */
#define SF_SETMODE	0x0040		/* Ignore Amiga protection bits */
#define SF_MUFS		0x0100		/* Use MUFS uid/gid mapping */
#define SF_OFS		0x0200		/* Old filesystem */
#define SF_PREFIX	0x0400		/* Buffer for prefix is allocated */
#define SF_VERBOSE	0x0800		/* Talk about fs when mounting */

/* short cut to get to the affs specific sb data */
static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

/* amigaffs.c */

extern int	affs_insert_hash(struct inode *inode, struct buffer_head *bh);
extern int	affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
extern int	affs_remove_header(struct dentry *dentry);
extern u32	affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
extern void	affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
extern void	secs_to_datestamp(time_t secs, struct affs_date *ds);
extern mode_t	prot_to_mode(u32 prot);
extern void	mode_to_prot(struct inode *inode);
extern void	affs_error(struct super_block *sb, const char *function, const char *fmt, ...);
extern void	affs_warning(struct super_block *sb, const char *function, const char *fmt, ...);
extern int	affs_check_name(const unsigned char *name, int len);
extern int	affs_copy_name(unsigned char *bstr, struct dentry *dentry);

/* bitmap. c */

extern u32	affs_count_free_blocks(struct super_block *s);
extern void	affs_free_block(struct super_block *sb, u32 block);
extern u32	affs_alloc_block(struct inode *inode, u32 goal);
extern int	affs_init_bitmap(struct super_block *sb, int *flags);
extern void	affs_free_bitmap(struct super_block *sb);

/* namei.c */

extern int	affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *);
extern int	affs_unlink(struct inode *dir, struct dentry *dentry);
extern int	affs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *);
extern int	affs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
extern int	affs_rmdir(struct inode *dir, struct dentry *dentry);
extern int	affs_link(struct dentry *olddentry, struct inode *dir,
			  struct dentry *dentry);
extern int	affs_symlink(struct inode *dir, struct dentry *dentry,
			     const char *symname);
extern int	affs_rename(struct inode *old_dir, struct dentry *old_dentry,
			    struct inode *new_dir, struct dentry *new_dentry);

/* inode.c */

extern unsigned long		 affs_parent_ino(struct inode *dir);
extern struct inode		*affs_new_inode(struct inode *dir);
extern int			 affs_notify_change(struct dentry *dentry, struct iattr *attr);
extern void			 affs_delete_inode(struct inode *inode);
extern void			 affs_clear_inode(struct inode *inode);
extern struct inode		*affs_iget(struct super_block *sb,
					unsigned long ino);
extern int			 affs_write_inode(struct inode *inode,
					struct writeback_control *wbc);
extern int			 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);

/* file.c */

void		affs_free_prealloc(struct inode *inode);
extern void	affs_truncate(struct inode *);
int		affs_file_fsync(struct file *, int);

/* dir.c */

extern void   affs_dir_truncate(struct inode *);

/* jump tables */

extern const struct inode_operations	 affs_file_inode_operations;
extern const struct inode_operations	 affs_dir_inode_operations;
extern const struct inode_operations   affs_symlink_inode_operations;
extern const struct file_operations	 affs_file_operations;
extern const struct file_operations	 affs_file_operations_ofs;
extern const struct file_operations	 affs_dir_operations;
extern const struct address_space_operations	 affs_symlink_aops;
extern const struct address_space_operations	 affs_aops;
extern const struct address_space_operations	 affs_aops_ofs;

extern const struct dentry_operations	 affs_dentry_operations;

static inline void
affs_set_blocksize(struct super_block *sb, int size)
{
	sb_set_blocksize(sb, size);
}
static inline struct buffer_head *
affs_bread(struct super_block *sb, int block)
{
	pr_debug("affs_bread: %d\n", block);
	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
		return sb_bread(sb, block);
	return NULL;
}
static inline struct buffer_head *
affs_getblk(struct super_block *sb, int block)
{
	pr_debug("affs_getblk: %d\n", block);
	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
		return sb_getblk(sb, block);
	return NULL;
}
static inline struct buffer_head *
affs_getzeroblk(struct super_block *sb, int block)
{
	struct buffer_head *bh;
	pr_debug("affs_getzeroblk: %d\n", block);
	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
		bh = sb_getblk(sb, block);
		lock_buffer(bh);
		memset(bh->b_data, 0 , sb->s_blocksize);
		set_buffer_uptodate(bh);
		unlock_buffer(bh);
		return bh;
	}
	return NULL;
}
static inline struct buffer_head *
affs_getemptyblk(struct super_block *sb, int block)
{
	struct buffer_head *bh;
	pr_debug("affs_getemptyblk: %d\n", block);
	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
		bh = sb_getblk(sb, block);
		wait_on_buffer(bh);
		set_buffer_uptodate(bh);
		return bh;
	}
	return NULL;
}
static inline void
affs_brelse(struct buffer_head *bh)
{
	if (bh)
		pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr);
	brelse(bh);
}

static inline void
affs_adjust_checksum(struct buffer_head *bh, u32 val)
{
	u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
	((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
}
static inline void
affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
{
	u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
	((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
}

static inline void
affs_lock_link(struct inode *inode)
{
	down(&AFFS_I(inode)->i_link_lock);
}
static inline void
affs_unlock_link(struct inode *inode)
{
	up(&AFFS_I(inode)->i_link_lock);
}
static inline void
affs_lock_dir(struct inode *inode)
{
	down(&AFFS_I(inode)->i_hash_lock);
}
static inline void
affs_unlock_dir(struct inode *inode)
{
	up(&AFFS_I(inode)->i_hash_lock);
}
static inline void
affs_lock_ext(struct inode *inode)
{
	down(&AFFS_I(inode)->i_ext_lock);
}
static inline void
affs_unlock_ext(struct inode *inode)
{
	up(&AFFS_I(inode)->i_ext_lock);
}
Commit	Line	Data
1da177e4 LT	1	#include <linux/types.h>
	2	#include <linux/fs.h>
	3	#include <linux/buffer_head.h>
1da177e4	4	#include <linux/amigaffs.h>
7d135a5d	5	#include <linux/mutex.h>
1da177e4 LT	6
	7	/* AmigaOS allows file names with up to 30 characters length.
	8	* Names longer than that will be silently truncated. If you
	9	* want to disallow this, comment out the following #define.
	10	* Creating filesystem objects with longer names will then
	11	* result in an error (ENAMETOOLONG).
	12	*/
	13	/#define AFFS_NO_TRUNCATE /
	14
	15	/* Ugly macros make the code more pretty. */
	16
	17	#define GET_END_PTR(st,p,sz) ((st )((char )(p)+((sz)-sizeof(st))))
	18	#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
	19	#define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
	20
	21	#ifdef __LITTLE_ENDIAN
	22	#define BO_EXBITS 0x18UL
	23	#elif defined(__BIG_ENDIAN)
	24	#define BO_EXBITS 0x00UL
	25	#else
	26	#error Endianness must be known for affs to work.
	27	#endif
	28
	29	#define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data)
	30	#define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
	31	#define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data)
	32	#define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
	33	#define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data)
	34	#define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data)
	35
	36	#define AFFS_CACHE_SIZE PAGE_SIZE
	37
	38	#define AFFS_MAX_PREALLOC 32
	39	#define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2)
	40	#define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
	41	#define AFFS_AC_MASK (AFFS_AC_SIZE-1)
	42
	43	struct affs_ext_key {
	44	u32 ext; /* idx of the extended block */
	45	u32 key; /* block number */
	46	};
	47
	48	/*
	49	* affs fs inode data in memory
	50	*/
	51	struct affs_inode_info {
dca3c336	52	atomic_t i_opencnt;
1da177e4 LT	53	struct semaphore i_link_lock; /* Protects internal inode access. */
	54	struct semaphore i_ext_lock; /* Protects internal inode access. */
	55	#define i_hash_lock i_ext_lock
	56	u32 i_blkcnt; /* block count */
	57	u32 i_extcnt; /* extended block count */
	58	u32 i_lc; / linear cache of extended blocks */
	59	u32 i_lc_size;
	60	u32 i_lc_shift;
	61	u32 i_lc_mask;
	62	struct affs_ext_key i_ac; / associative cache of extended blocks */
	63	u32 i_ext_last; /* last accessed extended block */
	64	struct buffer_head i_ext_bh; / bh of last extended block */
	65	loff_t mmu_private;
	66	u32 i_protect; /* unused attribute bits */
	67	u32 i_lastalloc; /* last allocated block */
	68	int i_pa_cnt; /* number of preallocated blocks */
	69	struct inode vfs_inode;
	70	};
	71
	72	/* short cut to get to the affs specific inode data */
	73	static inline struct affs_inode_info AFFS_I(struct inode inode)
	74	{
	75	return list_entry(inode, struct affs_inode_info, vfs_inode);
	76	}
	77
	78	/*
	79	* super-block data in memory
	80	*
	81	* Block numbers are adjusted for their actual size
	82	*
	83	*/
	84
	85	struct affs_bm_info {
	86	u32 bm_key; /* Disk block number */
	87	u32 bm_free; /* Free blocks in here */
	88	};
	89
	90	struct affs_sb_info {
	91	int s_partition_size; /* Partition size in blocks. */
	92	int s_reserved; /* Number of reserved blocks. */
	93	//u32 s_blksize; /* Initial device blksize */
	94	u32 s_data_blksize; /* size of the data block w/o header */
	95	u32 s_root_block; /* FFS root block number. */
	96	int s_hashsize; /* Size of hash table. */
	97	unsigned long s_flags; /* See below. */
	98	uid_t s_uid; /* uid to override */
	99	gid_t s_gid; /* gid to override */
	100	umode_t s_mode; /* mode to override */
	101	struct buffer_head s_root_bh; / Cached root block. */
7d135a5d	102	struct mutex s_bmlock; /* Protects bitmap access. */
1da177e4 LT	103	struct affs_bm_info s_bitmap; / Bitmap infos. */
	104	u32 s_bmap_count; /* # of bitmap blocks. */
	105	u32 s_bmap_bits; /* # of bits in one bitmap blocks */
	106	u32 s_last_bmap;
	107	struct buffer_head *s_bmap_bh;
	108	char s_prefix; / Prefix for volumes and assigns. */
1da177e4	109	char s_volume[32]; /* Volume prefix for absolute symlinks. */
29333920	110	spinlock_t symlink_lock; /* protects the previous two */
1da177e4 LT	111	};
	112
	113	#define SF_INTL 0x0001 /* International filesystem. */
	114	#define SF_BM_VALID 0x0002 /* Bitmap is valid. */
	115	#define SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */
	116	#define SF_QUIET 0x0008 /* chmod errors will be not reported */
	117	#define SF_SETUID 0x0010 /* Ignore Amiga uid */
	118	#define SF_SETGID 0x0020 /* Ignore Amiga gid */
	119	#define SF_SETMODE 0x0040 /* Ignore Amiga protection bits */
	120	#define SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */
	121	#define SF_OFS 0x0200 /* Old filesystem */
	122	#define SF_PREFIX 0x0400 /* Buffer for prefix is allocated */
	123	#define SF_VERBOSE 0x0800 /* Talk about fs when mounting */
	124
	125	/* short cut to get to the affs specific sb data */
	126	static inline struct affs_sb_info AFFS_SB(struct super_block sb)
	127	{
	128	return sb->s_fs_info;
	129	}
	130
	131	/* amigaffs.c */
	132
	133	extern int affs_insert_hash(struct inode inode, struct buffer_head bh);
	134	extern int affs_remove_hash(struct inode dir, struct buffer_head rem_bh);
	135	extern int affs_remove_header(struct dentry *dentry);
	136	extern u32 affs_checksum_block(struct super_block sb, struct buffer_head bh);
	137	extern void affs_fix_checksum(struct super_block sb, struct buffer_head bh);
	138	extern void secs_to_datestamp(time_t secs, struct affs_date *ds);
	139	extern mode_t prot_to_mode(u32 prot);
	140	extern void mode_to_prot(struct inode *inode);
	141	extern void affs_error(struct super_block sb, const char function, const char *fmt, ...);
	142	extern void affs_warning(struct super_block sb, const char function, const char *fmt, ...);
	143	extern int affs_check_name(const unsigned char *name, int len);
	144	extern int affs_copy_name(unsigned char bstr, struct dentry dentry);
	145
	146	/* bitmap. c */
	147
	148	extern u32 affs_count_free_blocks(struct super_block *s);
	149	extern void affs_free_block(struct super_block *sb, u32 block);
	150	extern u32 affs_alloc_block(struct inode *inode, u32 goal);
	151	extern int affs_init_bitmap(struct super_block sb, int flags);
	152	extern void affs_free_bitmap(struct super_block *sb);
	153
	154	/* namei.c */
	155
	156	extern int affs_hash_name(struct super_block sb, const u8 name, unsigned int len);
	157	extern struct dentry affs_lookup(struct inode dir, struct dentry dentry, struct nameidata );
	158	extern int affs_unlink(struct inode dir, struct dentry dentry);
	159	extern int affs_create(struct inode dir, struct dentry dentry, int mode, struct nameidata *);
	160	extern int affs_mkdir(struct inode dir, struct dentry dentry, int mode);
	161	extern int affs_rmdir(struct inode dir, struct dentry dentry);
	162	extern int affs_link(struct dentry olddentry, struct inode dir,
	163	struct dentry *dentry);
	164	extern int affs_symlink(struct inode dir, struct dentry dentry,
	165	const char *symname);
	166	extern int affs_rename(struct inode old_dir, struct dentry old_dentry,
	167	struct inode new_dir, struct dentry new_dentry);
	168
	169	/* inode.c */
	170
	171	extern unsigned long affs_parent_ino(struct inode *dir);
	172	extern struct inode affs_new_inode(struct inode dir);
	173	extern int affs_notify_change(struct dentry dentry, struct iattr attr);
1da177e4 LT	174	extern void affs_delete_inode(struct inode *inode);
1da177e4 LT	175	extern void affs_clear_inode(struct inode *inode);
210f8559 DH	176	extern struct inode affs_iget(struct super_block sb,
210f8559 DH	177	unsigned long ino);
a9185b41 CH	178	extern int affs_write_inode(struct inode *inode,
a9185b41 CH	179	struct writeback_control *wbc);
1da177e4 LT	180	extern int affs_add_entry(struct inode dir, struct inode inode, struct dentry *dentry, s32 type);
	181
	182	/* file.c */
	183
	184	void affs_free_prealloc(struct inode *inode);
	185	extern void affs_truncate(struct inode *);
7ea80859	186	int affs_file_fsync(struct file *, int);
1da177e4 LT	187
	188	/* dir.c */
	189
	190	extern void affs_dir_truncate(struct inode *);
	191
	192	/* jump tables */
	193
754661f1 AV	194	extern const struct inode_operations affs_file_inode_operations;
	195	extern const struct inode_operations affs_dir_inode_operations;
	196	extern const struct inode_operations affs_symlink_inode_operations;
4b6f5d20 AV	197	extern const struct file_operations affs_file_operations;
	198	extern const struct file_operations affs_file_operations_ofs;
	199	extern const struct file_operations affs_dir_operations;
f5e54d6e CH	200	extern const struct address_space_operations affs_symlink_aops;
	201	extern const struct address_space_operations affs_aops;
	202	extern const struct address_space_operations affs_aops_ofs;
1da177e4	203
e16404ed	204	extern const struct dentry_operations affs_dentry_operations;
1da177e4 LT	205
	206	static inline void
	207	affs_set_blocksize(struct super_block *sb, int size)
	208	{
	209	sb_set_blocksize(sb, size);
	210	}
	211	static inline struct buffer_head *
	212	affs_bread(struct super_block *sb, int block)
	213	{
	214	pr_debug("affs_bread: %d\n", block);
	215	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
	216	return sb_bread(sb, block);
	217	return NULL;
	218	}
	219	static inline struct buffer_head *
	220	affs_getblk(struct super_block *sb, int block)
	221	{
	222	pr_debug("affs_getblk: %d\n", block);
	223	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
	224	return sb_getblk(sb, block);
	225	return NULL;
	226	}
	227	static inline struct buffer_head *
	228	affs_getzeroblk(struct super_block *sb, int block)
	229	{
	230	struct buffer_head *bh;
	231	pr_debug("affs_getzeroblk: %d\n", block);
	232	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
	233	bh = sb_getblk(sb, block);
	234	lock_buffer(bh);
	235	memset(bh->b_data, 0 , sb->s_blocksize);
	236	set_buffer_uptodate(bh);
	237	unlock_buffer(bh);
	238	return bh;
	239	}
	240	return NULL;
	241	}
	242	static inline struct buffer_head *
	243	affs_getemptyblk(struct super_block *sb, int block)
	244	{
	245	struct buffer_head *bh;
	246	pr_debug("affs_getemptyblk: %d\n", block);
	247	if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
	248	bh = sb_getblk(sb, block);
	249	wait_on_buffer(bh);
	250	set_buffer_uptodate(bh);
	251	return bh;
	252	}
	253	return NULL;
	254	}
	255	static inline void
	256	affs_brelse(struct buffer_head *bh)
	257	{
	258	if (bh)
	259	pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr);
	260	brelse(bh);
	261	}
	262
	263	static inline void
	264	affs_adjust_checksum(struct buffer_head *bh, u32 val)
	265	{
	266	u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
	267	((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
	268	}
269	static inline void
270	affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
271	{
272	u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
273	((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
274	}
275
276	static inline void
277	affs_lock_link(struct inode *inode)
278	{
279	down(&AFFS_I(inode)->i_link_lock);
280	}
281	static inline void
282	affs_unlock_link(struct inode *inode)
283	{
284	up(&AFFS_I(inode)->i_link_lock);
285	}
286	static inline void
287	affs_lock_dir(struct inode *inode)
288	{
289	down(&AFFS_I(inode)->i_hash_lock);
290	}
291	static inline void
292	affs_unlock_dir(struct inode *inode)
293	{
294	up(&AFFS_I(inode)->i_hash_lock);
295	}
296	static inline void
297	affs_lock_ext(struct inode *inode)
298	{
299	down(&AFFS_I(inode)->i_ext_lock);
300	}
301	static inline void
302	affs_unlock_ext(struct inode *inode)
303	{
304	up(&AFFS_I(inode)->i_ext_lock);
305	}